'Circumcision' in the Bible

For circumcision indeed profiteth, if thou be a doer of the law: but if thou be a transgressor of the law, thy circumcision is become uncircumcision.

If therefore the uncircumcision keep the ordinances of the law, shall not his uncircumcision be reckoned for circumcision?

and shall not the uncircumcision which is by nature, if it fulfil the law, judge thee, who with the letter and circumcision art a transgressor of the law?

For he is not a Jew who is one outwardly; neither is that circumcision which is outward in the flesh:

but he is a Jew who is one inwardly; and circumcision is that of the heart, in the spirit not in the letter; whose praise is not of men, but of God.

What advantage then hath the Jew? or what is the profit of circumcision?

if so be that God is one, and he shall justify the circumcision by faith, and the uncircumcision through faith.

Is this blessing then pronounced upon the circumcision, or upon the uncircumcision also? for we say, To Abraham his faith was reckoned for righteousness.

How then was it reckoned? when he was in circumcision, or in uncircumcision? Not in circumcision, but in uncircumcision:

and he received the sign of circumcision, a seal of the righteousness of the faith which he had while he was in uncircumcision; that he might be the father of all them that believe, though they be in uncircumcision, that righteousness might be reckoned unto them;

and the father of circumcision to them who not only are of the circumcision, but who also walk in the steps of that faith of our father Abraham which he had in uncircumcision.

For I say that Christ hath been made a minister of the circumcision for the truth of God, that he might confirm the promises given unto the fathers,